Suiseki Phase Shifter User manual

Suiseki Phase Shifter for Eurorack
Thank you for purchasing the Suiseki circuit board and panel set. This document includes the parts
list, schematic, a reference layout image, construction notes and operation notes.
Construction Notes:
The attached bill of materials (BO ) lists all parts needed for the board. The BO uses mostly
Digikey product numbers for reference, but parts can of course be ordered from any supplier such as
ouser or your favorite octopart.com search result using the vendor numbers. Some folks like to use
all 1% metal film resistors, but it is not necessary. The only critical capacitors are C8 to C14 and C23
to C25, these need to be polyester film types. Note: there are seven 0.1uF bypass capacitors of the
usual X7R ceramic type.
The board is made with a standard hot air solder layer, but soldering with leaded solder is fine.
Similarly, you can use “no-clean” or organic solder, just be sure to rinse the board in the case of organic
solder.
The recommended soldering order is install all axial resistors first. Certain resistors are vertical-
mount: just bend one lead in a “U” such that it points down next to the other lead, then install. Next,
install the three ICs, then transistors and capacitors. These parts can all be soldered with organic flux-
core solder and rinsed in warm water. Be sure to allow sufficient time for the board to air dry.
Note: leave out capacitor C25 for now. It will be installed after the power header JP1 is installed. C25
is a tight fit and it is easier to deal with after JP1 (and R11) are mounted.
Note: four 15K resistors are omitted: R21, R28, R38, R39. These are bias resistors for the
linearizing diodes of the OTA cells. On this version they are not necessary and are not used.
The parts that must be soldered with rosin-core or “no-clean” low residue solder are the pots, jacks
and headers. Pay attention to the panel pots and jacks so they line up flush with the panel board. It is
helpful to check the fit for each panel part. Flat washers between the circuit board and the panel should
not be needed, just be sure to use a washer under each pot and jack nut in final assembly.
The trimpot R27 can be mounted on the top or bottom. It is used to tune the default position of the
phase shift response when no LFO or CV signal is present.
JP1 is a user’s choice of 2x5 or 2x8 shrouded header. For 2x5, the header installs in the lower 5 rows
of holes, leaving the top 3 rows open. The 2x8 header of course occupies all holes. In both cases the
header installs on the component side of the board with the notch to the right (toward edge of board).
Once JP1 is installed, go ahead and install capacitor C25.
LED: the LED is installed last, after the panel is installed. Using pliers make a right-angle downward
bend in the leads approx 4mm from the base of the LED with the shorter lead above the longer lead (as
seen before bending). Drop the LED leads into their PCB holes and gently nudge the LED into the
panel hole. Turn board over and solder one LED lead. Adjust the alignment if needed, then solder the
remaining lead. The LED will glow green for positive LFO half-cycles and red for negative LFO half-
cycles when installed correctly.

Suiseki Parts List for version 1
Qty Value Package RefDes Description Vendor No. Digikey Part No.
Capacitors (C3, C6, C17 and C22 designators are not used)
4 6800pF radial 5mm C13, C14, C23, C24 6800pF 50V film 5% B32529C1682J289 495-4894-1-ND
2 100nF radial 5mm C8, C10 0.1 uF 63V film 5% R82DC3100AA50J 399-5863-ND
7 100nF radial 5mm C1, C2, C7, C15, C16, 0.1 uF 50V X7R ceramic C322C104K5R5TA 399-4329-ND
4 470nF radial 5mm C9, C11, C12, C25 0.47 uF 63V film 5% R82DC3470Z360J 399-9690-ND
C20, C21
2 22uF radial 2.5mm C4, C5 22 uF, 50V alum 2.5mm EEU-FC1H220H P19653CT-ND
2 100uF radial 2.5mm C18, C19 100 uF, 35V alum, 2.5mm ECA-1V 101 P5165-ND
Resistors and potentiometers (may use all 1% if desired)
2 100R axial R25, R29 100 Ohm 1/4W 5% carbon CFR-25JB-52-100R 100QBK-ND
7 1K axial R9, R12, R23, R34, R49, 1K 1/4W 5% carbon film CFR-25JB-52-1K 1.0KQBK-ND
R55, R61
1 1K5 axial R11 1.5K 1/4W 5% carbon film CFR-25JB-52-1K5 1.5KQBK-ND
3 4K7 axial R6, R19, R30 4.7K 1/4W 5% carbon film CFR-25JB-52-4K7 4.7KQBK-ND
1 6K8 axial R2 6.8K 1/4W 5% carbon film CFR-25JB-52-6K8 6.8KQBK-ND
1 7K5 axial R17 7.5K 1/4W 5% carbon film CFR-25JB-52-7K5 7.5KQBK-ND
11 10K axial R5, R35, R36, R43, R45, R46, 10K 1/4W 5% carbon film CFR-25JB-52-10K 10KQBK-ND
R51, R52, R57, R58, R63
5* 15K axial R18, R21, R28, R38, R39 15K 1/4W 5% carbon film CFR-25JB-52-15K 15KQBK-ND
* - R21, R28, R38, R39 are optional, see notes
1 22K axial R4 22K 1/4W 5% carbon film CFR-25JB-52-22K 22KQBK-ND
8 27K axial R7, R33, R47, R48, R53, 27K 1/4W 5% carbon film CFR-25JB-52-27K 27KQBK-ND
R54, R59, R60
2 30K axial R24, R31 30K 1/4W 5% carbon film CFR-25JB-52-30K 30KQBK-ND
1 47K axial R10 47K 1/4W 5% carbon film CFR-25JB-52-47K 47KQBK-ND
2 56K axial R1, R26 56K 1/4W 5% carbon film CFR-25JB-52-56K 56KQBK-ND
1 82K axial R15 82K 1/4W 5% carbon film CFR-25JB-52-82K 82KQBK-ND
10 100K axial R3, R8, R14, R16, R32, 100K 1/4W 5% carbon film CFR-25JB-52-100K 100KQBK-ND
R37, R41, R50, R56, R62
1 220K axial R40 220K 1/4W 5% carbon film CFR-25JB-52-220K 220KQBK-ND
1 330K axial R22 330K 1/4W 5% carbon film CFR-25JB-52-330K 330KQBK-ND
2 470K axial R13, R20 470K 1/4W 5% carbon film CFR-25JB-52-470K 470KQBK-ND
Potentiometers are Alpha 9mm right-angle PC mount types from Thonk, Small Bear, Erthenvar, etc.
1 B10K 9mm R/A VR2 10K linear 9mm R/A PC mnt Erthenvar 9mm B10K
3 B100K 9mm R/A VR1, VR3, VR4 100K linear 9mm R/A PC mnt Erthenvar 9mm B100K
1 10K 3362 trimmer R27 10K linear trimpot 3362 series 3362P-1-103LF 3362P-103LF-ND
Semiconductors
1 TL074P quad opamp IC3 Quad JFET op-amp, PDIP14 TL074CN 296-1777-5-ND
2 L 13700 dual OTA IC5, IC6 Dual OTA, PDIP16 L 13700N L 13700N-ND
2 2N3906 PNP TO-92 Q1, Q2 PNP transistor TO-92 2N3906BU 2N3906FS-ND
10 2N3904 NPN TO-92 T1, T2, T3, T4, T5, NPN transistor TO-92 2N3904BU 2N3904FS-ND
T6, T7, T8, T9, T10
1 Bicolor LED 3mm I1 3mm red/green 2-lead LTL-14CHJ 160-1058-ND
Headers and connectors, jacks from Erthenvar, Thonk and other CUI vendors
3 3.5mm R/A PC jack J1, J2, J3 CUI-3536 jack Erthenvar 3536
1 2x5 shrouded header JP1 On Shore Technology 2x5 302-S101 ED1543-ND
1* 2x8 shrouded header JP1 On Shore Technology 2x8 302-S161 ED10523-ND
* - Only need one header for JP1, user choice of 2x5 or 2x8 for euro power
1 1x2 friction header JP2 TE Connectivity 1x2 640456-2 A1921-ND
isc.
1 Panel PCB (included)
4 knobs for 6mm shaft, recommend Erthenvar “mini fluted knob”

Operation Notes:
Header JP2 is provided if the user wishes to connect the onboard LFO to an external jack for general
use. The local LFO is switched through the CV jack: plugging a CV in disconnects the LFO. The “lvl”
knob attenuates the local LFO or external CV, whichever is active.
The “lfo” control adjusts sweep rate, while “frq” and “res” set the initial frequency of the phase shift
offset and resonant feedback.
odding note: to get a Univibe-type sound, the phase shift capacitors can be changed out for the
following values: C13 is 1nF, C14 is 10nF, C23 is 470pF and C24 is 4.7nF.
Calibration Notes:
Adjust R27 with “frq” fully CCW and “lvl” fully CCW to desired default setting.
Suiseki specifications:
DC power requirements: +/- 12VDC@50mA or +/-15VDC@40mA nominal
Frequency range: 0.1Hz to 20KHz
Input levels:
IN: 5Vp-p nominal
CV: -10V to +10V nominal.
Output levels:
OUT: 5Vp-p nominal
CV response: approx. 1V/octave
Dimensions: Panel width: 4HP (20.3mm or 0.800” with a 5 mil “slop gap”)
Panel height: 128.5mm (5.06”)
odule depth, mounted : 51mm (2”)
odule PCB internal height: 104.2mm (4.1”)
Old Crow's Synth Shop at www.cs80.com
January 2017
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Fig.1 Schematic

Fig.2 Board Reference